def f(x):
    s = 0
    for i in range(len(x)):
        if x[i] == '3':
            return f(x[:i] + '2' + '9'*(len(x)-i-1))
        s += int(x[i])
    if s % 3 != 0:
        return x

    for i in range(len(x)-1, -1, -1):
        if x[i] != '0':
            return x[:i] + str(int(x[i])-1) + '9'*(len(x)-i-1)

    assert False


def main():
    print(f(input()))


if __name__ == '__main__':
    main()